asmlinkage long sys_eventfd2(unsigned int count, int flags)
{
int fd;
struct eventfd_ctx *ctx;
/* Check the EFD_* constants for consistency. */
BUILD_BUG_ON(EFD_CLOEXEC != O_CLOEXEC);
BUILD_BUG_ON(EFD_NONBLOCK != O_NONBLOCK);
if (flags & ~(EFD_CLOEXEC | EFD_NONBLOCK))
return -EINVAL;
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
init_waitqueue_head(&ctx->wqh);
ctx->count = count;
/*
* When we call this, the initialization must be complete, since
* anon_inode_getfd() will install the fd.
*/
fd = anon_inode_getfd("[eventfd]", &eventfd_fops, ctx,
flags & (O_CLOEXEC | O_NONBLOCK));
if (fd < 0)
kfree(ctx);
return fd;
}
asmlinkage long sys_eventfd(unsigned int count)
{
int error, fd;
struct eventfd_ctx *ctx;
struct file *file;
struct inode *inode;
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
init_waitqueue_head(&ctx->wqh);
ctx->count = count;
/*
* When we call this, the initialization must be complete, since
* anon_inode_getfd() will install the fd.
*/
error = anon_inode_getfd(&fd, &inode, &file, "[eventfd]",
&eventfd_fops, ctx);
if (!error)
return fd;
kfree(ctx);
return error;
}
static int do_eventfd(unsigned int count, int flags)
{
struct eventfd_ctx *ctx;
int fd;
/* Check the EFD_* constants for consistency. */
BUILD_BUG_ON(EFD_CLOEXEC != O_CLOEXEC);
BUILD_BUG_ON(EFD_NONBLOCK != O_NONBLOCK);
if (flags & ~EFD_FLAGS_SET)
return -EINVAL;
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
kref_init(&ctx->kref);
init_waitqueue_head(&ctx->wqh);
ctx->count = count;
ctx->flags = flags;
ctx->id = ida_simple_get(&eventfd_ida, 0, 0, GFP_KERNEL);
fd = anon_inode_getfd("[eventfd]", &eventfd_fops, ctx,
O_RDWR | (flags & EFD_SHARED_FCNTL_FLAGS));
if (fd < 0)
eventfd_free_ctx(ctx);
return fd;
}
SYSCALL_DEFINE4(waitfd, int, which, pid_t, upid, int, options, int, flags)
{
int ufd;
struct waitfd_ctx *ctx;
/*
* Options validation from do_waitid()
*/
if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED))
return -EINVAL;
if (!(options & (WEXITED|WSTOPPED|WCONTINUED)))
return -EINVAL;
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->options = options;
ctx->upid = upid;
ctx->which = which;
ufd = anon_inode_getfd("[waitfd]", &waitfd_fops, ctx,
O_RDWR | flags | ((options & WNOHANG) ?
O_NONBLOCK | 0 : 0));
/*
* Use the fd's nonblocking state from now on, since that can change.
*/
ctx->options &= ~WNOHANG;
if (ufd < 0)
kfree(ctx);
return ufd;
}
static int sync_setup(const char *name, const struct file_operations *fops,
struct dsscomp_sync_obj *sync, int flags)
{
if (!sync)
return -ENOMEM;
sync->refs.counter = 1;
sync->fd = anon_inode_getfd(name, fops, sync, flags);
return sync->fd < 0 ? sync->fd : 0;
}
SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
size_t, sizemask, int, flags)
{
sigset_t sigmask;
struct signalfd_ctx *ctx;
/* Check the SFD_* constants for consistency. */
BUILD_BUG_ON(SFD_CLOEXEC != O_CLOEXEC);
BUILD_BUG_ON(SFD_NONBLOCK != O_NONBLOCK);
if (flags & ~(SFD_CLOEXEC | SFD_NONBLOCK))
return -EINVAL;
if (sizemask != sizeof(sigset_t) ||
copy_from_user(&sigmask, user_mask, sizeof(sigmask)))
return -EINVAL;
sigdelsetmask(&sigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
signotset(&sigmask);
if (ufd == -1) {
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->sigmask = sigmask;
/*
* When we call this, the initialization must be complete, since
* anon_inode_getfd() will install the fd.
*/
ufd = anon_inode_getfd("[signalfd]", &signalfd_fops, ctx,
flags & (O_CLOEXEC | O_NONBLOCK));
if (ufd < 0)
kfree(ctx);
} else {
struct file *file = fget(ufd);
if (!file)
return -EBADF;
ctx = file->private_data;
if (file->f_op != &signalfd_fops) {
fput(file);
return -EINVAL;
}
spin_lock_irq(¤t->sighand->siglock);
ctx->sigmask = sigmask;
spin_unlock_irq(¤t->sighand->siglock);
wake_up(¤t->sighand->signalfd_wqh);
fput(file);
}
return ufd;
}
asmlinkage long sys_signalfd(int ufd, sigset_t __user *user_mask, size_t sizemask)
{
int error;
sigset_t sigmask;
struct signalfd_ctx *ctx;
struct file *file;
struct inode *inode;
if (sizemask != sizeof(sigset_t) ||
copy_from_user(&sigmask, user_mask, sizeof(sigmask)))
return -EINVAL;
sigdelsetmask(&sigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
signotset(&sigmask);
if (ufd == -1) {
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->sigmask = sigmask;
/*
* When we call this, the initialization must be complete, since
* anon_inode_getfd() will install the fd.
*/
error = anon_inode_getfd(&ufd, &inode, &file, "[signalfd]",
&signalfd_fops, ctx);
if (error)
goto err_fdalloc;
} else {
file = fget(ufd);
if (!file)
return -EBADF;
ctx = file->private_data;
if (file->f_op != &signalfd_fops) {
fput(file);
return -EINVAL;
}
spin_lock_irq(¤t->sighand->siglock);
ctx->sigmask = sigmask;
spin_unlock_irq(¤t->sighand->siglock);
wake_up(¤t->sighand->signalfd_wqh);
fput(file);
}
return ufd;
err_fdalloc:
kfree(ctx);
return error;
}
SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
size_t, sizemask, int, flags)
{
sigset_t sigmask;
struct signalfd_ctx *ctx;
BUILD_BUG_ON(SFD_CLOEXEC != O_CLOEXEC);
BUILD_BUG_ON(SFD_NONBLOCK != O_NONBLOCK);
if (flags & ~(SFD_CLOEXEC | SFD_NONBLOCK))
return -EINVAL;
if (sizemask != sizeof(sigset_t) ||
copy_from_user(&sigmask, user_mask, sizeof(sigmask)))
return -EINVAL;
sigdelsetmask(&sigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
signotset(&sigmask);
if (ufd == -1) {
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->sigmask = sigmask;
ufd = anon_inode_getfd("[signalfd]", &signalfd_fops, ctx,
O_RDWR | (flags & (O_CLOEXEC | O_NONBLOCK)));
if (ufd < 0)
kfree(ctx);
} else {
struct file *file = fget(ufd);
if (!file)
return -EBADF;
ctx = file->private_data;
if (file->f_op != &signalfd_fops) {
fput(file);
return -EINVAL;
}
spin_lock_irq(¤t->sighand->siglock);
ctx->sigmask = sigmask;
spin_unlock_irq(¤t->sighand->siglock);
wake_up(¤t->sighand->signalfd_wqh);
fput(file);
}
return ufd;
}
int au_fhsm_fd(struct super_block *sb, int oflags)
{
int err, fd;
struct au_sbinfo *sbinfo;
struct au_fhsm *fhsm;
err = -EPERM;
if (unlikely(!capable(CAP_SYS_ADMIN)))
goto out;
err = -EINVAL;
if (unlikely(oflags & ~(O_CLOEXEC | O_NONBLOCK)))
goto out;
err = 0;
sbinfo = au_sbi(sb);
fhsm = &sbinfo->si_fhsm;
spin_lock(&fhsm->fhsm_spin);
if (!fhsm->fhsm_pid)
fhsm->fhsm_pid = current->pid;
else
err = -EBUSY;
spin_unlock(&fhsm->fhsm_spin);
if (unlikely(err))
goto out;
oflags |= O_RDONLY;
/* oflags |= FMODE_NONOTIFY; */
fd = anon_inode_getfd("[aufs_fhsm]", &au_fhsm_fops, sbinfo, oflags);
err = fd;
if (unlikely(fd < 0))
goto out_pid;
/* succeed reglardless 'fhsm' status */
kobject_get(&sbinfo->si_kobj);
si_noflush_read_lock(sb);
if (au_ftest_si(sbinfo, FHSM))
au_fhsm_wrote_all(sb, /*force*/0);
si_read_unlock(sb);
goto out; /* success */
out_pid:
spin_lock(&fhsm->fhsm_spin);
fhsm->fhsm_pid = 0;
spin_unlock(&fhsm->fhsm_spin);
out:
AuTraceErr(err);
return err;
}
static long hiboma_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
long r = -EINVAL;
switch(ioctl) {
case HIBOMA_GET_VERSION:
r = HIBOMA_VERSION;
break;
case HIBOMA_OPEN_FD:
r = anon_inode_getfd("hiboma-anon", &hiboma_anon_fops,
NULL, O_RDWR | O_CLOEXEC);
}
return r;
}
mali_error kbase_stream_create(const char *name, int *const out_fd)
{
struct sync_timeline *tl;
BUG_ON(!out_fd);
tl = kbase_sync_timeline_alloc(name);
if (!tl)
return MALI_ERROR_FUNCTION_FAILED;
*out_fd = anon_inode_getfd(name, &stream_fops, tl, O_RDONLY | O_CLOEXEC);
if (*out_fd < 0) {
sync_timeline_destroy(tl);
return MALI_ERROR_FUNCTION_FAILED;
} else {
return MALI_ERROR_NONE;
}
}
int kbase_stream_create(const char *name, int *const out_fd)
{
struct sync_timeline *tl;
BUG_ON(!out_fd);
tl = kbase_sync_timeline_alloc(name);
if (!tl)
return -EINVAL;
*out_fd = anon_inode_getfd(name, &stream_fops, tl, O_RDONLY | O_CLOEXEC);
if (*out_fd < 0) {
sync_timeline_destroy(tl);
return -EINVAL;
}
return 0;
}
/* 这才是真正的epoll_create啊~~ */
SYSCALL_DEFINE1(epoll_create1, int, flags)
{
int error;
struct eventpoll *ep = NULL;
/* Check the EPOLL_* constant for consistency. */
/* 这句没啥用处... */
BUILD_BUG_ON(EPOLL_CLOEXEC != O_CLOEXEC);
/* 对于epoll来讲, 目前唯一有效的FLAG就是CLOEXEC */
if (flags & ~EPOLL_CLOEXEC)
return -EINVAL;
/*
* Create the internal data structure ("struct eventpoll").
*/
/* 分配一个struct eventpoll, 分配和初始化细节我们随后深聊~ */
error = ep_alloc(&ep);
if (error < 0)
return error;
/*
* Creates all the items needed to setup an eventpoll file. That is,
* a file structure and a free file descriptor.
*/
/* 这里是创建一个匿名fd, 说起来就话长了...长话短说:
* epollfd本身并不存在一个真正的文件与之对应, 所以内核需要创建一个
* "虚拟"的文件, 并为之分配真正的struct file结构, 而且有真正的fd.
* 这里2个参数比较关键:
* eventpoll_fops, fops就是file operations, 就是当你对这个文件(这里是虚拟的)进行操作(比如读)时,
* fops里面的函数指针指向真正的操作实现, 类似C++里面虚函数和子类的概念.
* epoll只实现了poll和release(就是close)操作, 其它文件系统操作都有VFS全权处理了.
* ep, ep就是struct epollevent, 它会作为一个私有数据保存在struct file的private指针里面.
* 其实说白了, 就是为了能通过fd找到struct file, 通过struct file能找到eventpoll结构.
* 如果懂一点Linux下字符设备驱动开发, 这里应该是很好理解的,
* 推荐阅读 <Linux device driver 3rd>
*/
error = anon_inode_getfd("[eventpoll]", &eventpoll_fops, ep,
O_RDWR | (flags & O_CLOEXEC));
if (error < 0)
ep_free(ep);
return error;
}
long do_signalfd(int ufd, sigset_t *sigmask, int flags)
{
struct signalfd_ctx *ctx;
if (ufd == -1) {
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->sigmask = *sigmask;
/*
* When we call this, the initialization must be complete, since
* anon_inode_getfd() will install the fd.
*/
ufd = anon_inode_getfd("[signalfd]", &signalfd_fops, ctx,
flags & (O_CLOEXEC | O_NONBLOCK));
if (ufd < 0)
kfree(ctx);
} else {
struct file *file = fget(ufd);
if (!file)
return -EBADF;
ctx = file->private_data;
if (file->f_op != &signalfd_fops) {
fput(file);
return -EINVAL;
}
spin_lock_irq(¤t->sighand->siglock);
ctx->sigmask = *sigmask;
spin_unlock_irq(¤t->sighand->siglock);
wake_up(¤t->sighand->signalfd_wqh);
fput(file);
}
return ufd;
}
_mali_osk_errcode_t mali_stream_create(const char * name, int *out_fd)
{
struct sync_timeline * tl;
BUG_ON(!out_fd);
tl = mali_sync_timeline_alloc(name);
if (!tl)
{
return _MALI_OSK_ERR_FAULT;
}
*out_fd = anon_inode_getfd(name, &stream_fops, tl, O_RDONLY | O_CLOEXEC);
if (*out_fd < 0)
{
sync_timeline_destroy(tl);
return _MALI_OSK_ERR_FAULT;
}
else
{
return _MALI_OSK_ERR_OK;
}
}
int tee_session_create_fd(struct tee_context *ctx, struct tee_cmd_io *cmd_io)
{
int ret;
struct tee_session *sess;
struct tee *tee = ctx->tee;
BUG_ON(cmd_io->fd_sess > 0);
dev_dbg(_DEV(tee), "%s: >\n", __func__);
sess = tee_session_create_and_open(ctx, cmd_io);
if (IS_ERR_OR_NULL(sess)) {
ret = PTR_ERR(sess);
dev_dbg(_DEV(tee), "%s: ERROR can't create the session (ret=%d, err=0x%08x, org=%d)\n",
__func__, ret, cmd_io->err, cmd_io->origin);
cmd_io->fd_sess = -1;
goto out;
}
/* Retrieve a fd */
cmd_io->fd_sess = -1;
ret =
anon_inode_getfd("tee_session", &tee_session_fops, sess, O_CLOEXEC);
if (ret < 0) {
dev_err(_DEV(tee), "%s: ERROR can't get a fd (ret=%d)\n",
__func__, ret);
tee_session_close_and_destroy(sess);
goto out;
}
cmd_io->fd_sess = ret;
ret = 0;
out:
dev_dbg(_DEV(tee), "%s: < ret=%d, sess=%p, fd=%d\n", __func__,
ret, sess, cmd_io->fd_sess);
return ret;
}
/* get a file descriptor corresponding to the channel
*/
int vbus_chnx_get_fd(unsigned char chnr,
unsigned char prio,
int oflag)
{
/* supress compiler waring: cast to pointer from integer of different
* size */
unsigned long lchnr = chnr;
int fd = anon_inode_getfd("[vbus_chnx]", &vbus_chnx_fops,
(void*)lchnr, oflag);
if (fd > 0) {
if (prio == 0)
prio = 1;
else if (prio > 255)
prio = 255;
_ctxs[chnr].prio = prio;
_ctxs[chnr].datap = NULL;
_ctxs[chnr].pos = 0;
}
_ctxs[chnr].fd = fd;
pr_info("get fd: %d, prio: %d\n", fd, prio);
return fd;
}
/*
* Start requested lock.
*
* Allocates required memory, copies dma_buf_fd list from userspace,
* acquires related KDS resources, and starts the lock.
*/
static int dma_buf_lock_dolock(dma_buf_lock_k_request *request)
{
dma_buf_lock_resource *resource;
int size;
int fd;
int i;
int ret;
if (NULL == request->list_of_dma_buf_fds)
{
return -EINVAL;
}
if (request->count <= 0)
{
return -EINVAL;
}
if (request->count > DMA_BUF_LOCK_BUF_MAX)
{
return -EINVAL;
}
if (request->exclusive != DMA_BUF_LOCK_NONEXCLUSIVE &&
request->exclusive != DMA_BUF_LOCK_EXCLUSIVE)
{
return -EINVAL;
}
resource = kzalloc(sizeof(dma_buf_lock_resource), GFP_KERNEL);
if (NULL == resource)
{
return -ENOMEM;
}
atomic_set(&resource->locked, 0);
kref_init(&resource->refcount);
INIT_LIST_HEAD(&resource->link);
resource->count = request->count;
/* Allocate space to store dma_buf_fds received from user space */
size = request->count * sizeof(int);
resource->list_of_dma_buf_fds = kmalloc(size, GFP_KERNEL);
if (NULL == resource->list_of_dma_buf_fds)
{
kfree(resource);
return -ENOMEM;
}
/* Allocate space to store dma_buf pointers associated with dma_buf_fds */
size = sizeof(struct dma_buf *) * request->count;
resource->dma_bufs = kmalloc(size, GFP_KERNEL);
if (NULL == resource->dma_bufs)
{
kfree(resource->list_of_dma_buf_fds);
kfree(resource);
return -ENOMEM;
}
/* Allocate space to store kds_resources associated with dma_buf_fds */
size = sizeof(struct kds_resource *) * request->count;
resource->kds_resources = kmalloc(size, GFP_KERNEL);
if (NULL == resource->kds_resources)
{
kfree(resource->dma_bufs);
kfree(resource->list_of_dma_buf_fds);
kfree(resource);
return -ENOMEM;
}
/* Copy requested list of dma_buf_fds from user space */
size = request->count * sizeof(int);
if (0 != copy_from_user(resource->list_of_dma_buf_fds, (void __user *)request->list_of_dma_buf_fds, size))
{
kfree(resource->list_of_dma_buf_fds);
kfree(resource->dma_bufs);
kfree(resource->kds_resources);
kfree(resource);
return -ENOMEM;
}
#if DMA_BUF_LOCK_DEBUG
for (i = 0; i < request->count; i++)
{
printk("dma_buf %i = %X\n", i, resource->list_of_dma_buf_fds[i]);
}
#endif
/* Add resource to global list */
mutex_lock(&dma_buf_lock_mutex);
list_add(&resource->link, &dma_buf_lock_resource_list);
mutex_unlock(&dma_buf_lock_mutex);
for (i = 0; i < request->count; i++)
{
/* Convert fd into dma_buf structure */
resource->dma_bufs[i] = dma_buf_get(resource->list_of_dma_buf_fds[i]);
if (IS_ERR_VALUE(PTR_ERR(resource->dma_bufs[i])))
{
mutex_lock(&dma_buf_lock_mutex);
kref_put(&resource->refcount, dma_buf_lock_dounlock);
mutex_unlock(&dma_buf_lock_mutex);
return -EINVAL;
}
/*Get kds_resource associated with dma_buf */
resource->kds_resources[i] = get_dma_buf_kds_resource(resource->dma_bufs[i]);
if (NULL == resource->kds_resources[i])
{
mutex_lock(&dma_buf_lock_mutex);
kref_put(&resource->refcount, dma_buf_lock_dounlock);
mutex_unlock(&dma_buf_lock_mutex);
return -EINVAL;
}
#if DMA_BUF_LOCK_DEBUG
printk("dma_buf_lock_dolock : dma_buf_fd %i dma_buf %X kds_resource %X\n", resource->list_of_dma_buf_fds[i],
(unsigned int)resource->dma_bufs[i], (unsigned int)resource->kds_resources[i]);
#endif
}
kds_callback_init(&resource->cb, 1, dma_buf_lock_kds_callback);
init_waitqueue_head(&resource->wait);
kref_get(&resource->refcount);
/* Create file descriptor associated with lock request */
fd = anon_inode_getfd("dma_buf_lock", &dma_buf_lock_handle_fops,
(void *)resource, 0);
if (fd < 0)
{
mutex_lock(&dma_buf_lock_mutex);
kref_put(&resource->refcount, dma_buf_lock_dounlock);
kref_put(&resource->refcount, dma_buf_lock_dounlock);
mutex_unlock(&dma_buf_lock_mutex);
return fd;
}
resource->exclusive = request->exclusive;
/* Start locking process */
ret = kds_async_waitall(&resource->resource_set,KDS_FLAG_LOCKED_ACTION,
&resource->cb, resource, NULL,
request->count, &resource->exclusive,
resource->kds_resources);
if (IS_ERR_VALUE(ret))
{
put_unused_fd(fd);
mutex_lock(&dma_buf_lock_mutex);
kref_put(&resource->refcount, dma_buf_lock_dounlock);
mutex_unlock(&dma_buf_lock_mutex);
return ret;
}
#if DMA_BUF_LOCK_DEBUG
printk("dma_buf_lock_dolock : complete\n");
#endif
mutex_lock(&dma_buf_lock_mutex);
kref_put(&resource->refcount, dma_buf_lock_dounlock);
mutex_unlock(&dma_buf_lock_mutex);
return fd;
}